A-32
Water Heat Exchanger Unit
8. Center of gravity and
earthquake resistance
(4) Example anchor bolt calculation
Example of evaluation using calculations (In the case of S-710WX2E5)
(1) Anchor bolt conditions
1) Total no. of bolts (N)
N = 4
current models have four bolts
2) Bolt diameter (D)
D = 12 mm for M12 bolts
3) Bolt cross-sectional area (A)
A =
π
D
2
/ 4 = 113 mm
2
4) Bolts on one side (end-on direction, n
1
) n
1
= 2
current models have two bolts
(broadside direction, n
2
) n
2
= 2
current models have two bolts
5) The installation method is for “embedded J or JA type bolts,” on a 15-cm-thick slab
Anchor bolt allowable short-term tensile load (T
a
) Ta = 11,760 N
(The installation method may also be selected after completing calculations.)
(2) Calculation
1) Design horizontal seismic magnitude (K
H
) K
H
= 1.0 Installation location: K
H
roof :
1.0
ground
:
0.4
2) Operating load (W)
W = 1,470 N
(= operating mass × 9.8)
3) Horizontal earthquake force (F
H
) F
H
= K
H
· W = 1,470 N
4) Height of center-of-gravity (h
G
) h
G
= 414 mm
5) Vertical earthquake force (F
V
) F
V
= F
H
/ 2 = 735 N
6) Distance from center-of-gravity to bolt
End-on direction (L
G1
) L
G1
= 555 mm
Broadside direction (L
G2
) L
G2
= 138.5 mm
7) Bolt
span
End-on direction (L
1
) L
1
= 1,014 mm
Broadside direction (L
2
) L
2
= 312 mm
GHP Chiller TECHNICAL DATA.indb A-32
GHP Chiller TECHNICAL DATA.indb A-32
2012/04/06 13:42:07
2012/04/06 13:42:07
